Method of forming disk wheels



G. H. FORSYTH.

METHOD OF FORMING DISK WHEELS.

APPLICATION msnnov. 10,1919.

1,399,951, Patented Dec. 13, 1921.

WITNESS: INVENT v 1 GEORGE H. FoRsv' XW W ATTORNEYS 9 UNITED .STATES'PATENT ole-Flea,

' GEORGE E; ronsy'rn, or cmcseo, Int-mom. i

METHOD OF FORMING DISK WHEELS.

Specification of Letters Patent.

Patented Dec. 13, 1921.

Application filed November 10, 1919. Serial m. 5,780;

T 0 all whom it may concern Be it known that I, GEORGE H. FORSYTH,.

a citizen of the United States, residing at Chicago, in the county ofCook and State of ticularly adapted to the forming of such I .wheelshaving a taper cross section, that is to say, progressively decreasingin thickness from the hub to the periphery.

Heretofore it has been usual to blank a disk of suitable size from alarge sheet, punch a central hub orifice and then by means of a pressingdie to form hub and rim flanges and dish the same more or less as may bewished. This involves a great waste of metal. Where it is desired toproduce a wheel of taper cross section, it was usual to grind or millthe same at an immense labor cost and the production of an inferioropen-pore disk.

It has been proposed to, take a sheet or .stri poi metal, bend it atright angles to the plane thereof to form acylinder, weld the endstogether, and then expand one end of the cylinder by rolling togradually change the cylinder to. disk form, thus at the same timeproducing by the rolling action a re duction in thickness of theexpanded edge and'a resultant taper cross section. method necessitated anumber of successive operations, as the rolling expansion or stretchingof the metal after welding is exceedingly difficult to effect without arupture of the weld.

By my improved method, a. reversal ofthe procedure last referred to, thesheet is bent in the plane thereof to a disk form by rolling and thusexpanding one edge of the sheet and, if desired, concurrently turning;over each edge to form hub and mm flanges, then welding the adjacentedges and, if found then desirable, subjecting to a truing die.-

' section, and with no dangerof breaking the weld.

In order that the I may be more readily comprehended, I have,

This

method thus outlined a in the inclosed drawing, illustrated"diagrammatically the'several steps of the operation. The drawing is notto be understood as illustrating the best form of apparatus for carryingout the method which is not de endentin any, way upon the particular ormof mechanism employed.

In the drawing- Figure 1. is a side elevation of the disk partiallyformed;

Fig. 2 is a conventionalized end view-of I Fig. 1;-

Fig. 3

signed to render the same slightly dished or concavo convex; I

.Fig. 5 is a modified form of disk in the shape of an incompleteannulus;

v Fig. I 5' represents the i disk of dished disk or one'of conicularform; and

Fig. 7 illustrates the last mentioned disk associated with a truing die.j I 1 Having reference to the drawings for exemplification, a sheet 11of suitable cross section of strip form is passed between the rollers 12whereby one edgeof the same is expanded so as to produce a taper crosssection as indicated at 11. In order to produce a 15 is arranged to bearupon one edge of the illustrates the disk after forming a ready forwelding;

sheet and the roller 16 upon, the opposite.

edge. The passing of the sheet between the rollers 12-12 and theconsequent stretchin of one edge thereof results in the bending o thesheet in its plane to form a disk 17, as will be readily understood. Ifthe metal is chosen of a length to form the complete disk the resultwill be that shown in'Fig. 3, whereas if the metal is of'slightly lesslength it will be that shown in Fi 5.' In the former case the two edges17 a an 17 are in juxtaposition and approximately in contact asillustrated in 'Fig. 3; in the latter case, the edges 17 a and 17". aremore widely spaced apart as utilized in the shape as shown or placed ina es fFisl3rbein forming die as illustrated insaid figure and 7 broughtto a concavo-convex or slightly fdishedform'.

The edges 17 and 17" of Flg. '5.be1ngwelded, the'result is a diskconcavo-convexv or dish form such as is shown in Figs. 6 and 7 which bymeans of the die shown in the latter figure only requires truing toovercome any slight inaccuracies.

It will be observed that by my improved method, the sheet 11 of uniformcross section is in one continuous operation formed into an annulus oftaper cross section and with or without hub and rim flanges as may bedesired. The disk is thus completely formed and tapered in cross sectionprior to welding whereby any danger of breaking of the weld is obviated.The operation is an exceedingly, inexpensive one. There is l practicallyno waste of metal. The result ant disk is accurately formed and withoutany breaking down of the metal structure as results from the prior artmethod. o,

While I have shown the disk rolled into 2 the flat and then, formed intothe shape desired as by dies, it must be obvious that the rolls couldthemselves be so formed.

upon their bearing surfaces as to form the metal vdisk into final shape,or the disk could 2 be formed into the final shape desired by anotherset of rolls instead of the dies shown. In other words, the disk mightbe formed into substantially its final shape during the producing of thedisk and before welding,

89 or could be formed into its final shape after welding. P

'While I have referred to the metal from which the disk is formed as asheet, it must be evident that the same might be a strip 85 or bar ofany suitable dimensions, and it must also be evident that the disk couldbe' formed into any desired cross section,

either before or after welding, and by any suitable meansfor thispurpose without los- 40 ing the advantage already mentioned of producinga disk of whatever form with the least possible waste of material.

I claim: 1. The method of forming disk Wheels from sheets of metal whichconsists in bending the sheet in the plane thereof to form an annulusand simultaneously to cause progressive expansion of the same toward theperiphery whereby to taper the cross section. 2. The method of formingdisk wheels from sheets of metal which consists in bending the sheet inthe plane thereof to form an approximately flat annulus and thereafterwelding the adjacent ends of the annulus. 3. The method of forming diskwheels of taper cross section from sheets of metal of uniform gage whichconsists in bending the 6 sheet in the plane thereof ,to form anapproximotely fiat annulus and to cause pro- 'gressive expansion .of thesame toward the periphery whereby to. taper the cross section, and thenwelding the adjacent ends 65 of the annulus.

4. The method of forming disk wheels of taper cross section-from sheetsof metal of uniform gage which consists in bending the sheet in theplane thereof to form an approximately flat annulus and to causeprogressive expansion ofthe'same toward the -periphery whereby to taperthe cross section, and in the same continuous operation laterally,bending the edges of the sheet to form hub and rim flanges, and thenwelding the adjacent ends of the annulus.

-5. The method of forming disk wheels of taper cross section from sheetsof metal of uniform gage which consists in bending the sheet in theiplane thereofto form an approximately at annulus and to causeprogressive expansion of the same toward the periphery whereby to taperthe cross section, and in the same continuous operation laterallybending the edges of the sheet to form hub and' rim flanges, and thenwelding the adjacent ends of the annulus and finally (siubjecting. thedisk to a j-truingandshaping 6. The method of formingdished disk Wheelsfrom metal strips which consists in bending a strip substantially in theplane thereof to form an annulus. having a segment gap and welding theadjacent ends oftheannulns to form a dished disk.

7. The method of forming disk wheels from metal strips which consists inbending a strip into an annulus and in the same continuous operationforming the central and peripheral portions of said disk into anydesired shape relative to the plane of the annulus. I v

8. The method of forming disk wheels from metal stri s which consistsinbending a strip substantially in the plane'thereof to form an ahnulusthen welding the adjacent ends of the annulus, and finally subjectingthe disk to a forming'die to vary the plane thereof. v I v 9. A methodof forming disk wheels from strips of sheet metal which consistsinbending the sheetin the plane thereof to form an annulus of the desiredcontour and thereafter joining the adjacent ends of the annulus. (1 v10. A method of forming dished disks from a fiat strip of metal whichconsists in bending the same and joining the adjacent ends to form anannulus and then subjecting concentric portions of the metal todeforming stress whereby to vary the original contour of the annulus. I

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

" GEORGE FoRsrTHy Witnesses: i I I FRANCES K.' .GILLEsPIE, RAY OND I1.GREIsT.

